Paper-making machine



Jan. 3, I928.

, A. 'E. COFRIN PAPER MAKING MACHINE Filed June 12, 19 24 T at? 40 that frequent breakage occurs in se 50 the felt,

Patented Jan. 3, 1928,

u'm'rso STATES P TENT o-F-F ca- AUSTIN E. comm, or eanniv Ber, wrsconsm.

Z'EAPEBHHAKING MACHINE. 1

Application filed June 12,

This invention relates to paper making, and particularly to the handling of paper' mgilzliper making machines. 4

r e of the main problems encountered I in the making of paper is to keep the paper continuously running'over the paper machine without adhering to and breaking on the press rolls used in connection with the paper carrying felts for pressing out moisture and getting the paper into as dr a state as possible. In some instances the lm of paper is carried through the prom rolls between two felts; in other cases it is car ried through the press rolls on one felt ll only. In either case the web of paper must eventually be taken off the felt or elts and carried over the" remainder of the machine to be wound on reels.

The customary way of accomplishing this removal of the web of paper from its carrying felt is to run both the felt and web of aper between two or more rollers, separating the ipaper web from the felt by leading them 0 26 have passed through the rollers, These rollers are arranged to exert pressure on the in different directions after they felt and web of paper for'the purpose of effecting separation of the paper from the felt, in accordance with the fact that the web of aperhas a tendency to adhere to the her er of two surfaces withwhich it is brought in contact, and the desired slightly increased adherence of the paper web to the metal roll aids in effecting its separation 36 from the felt.

By this method of separatin the paper from the felt, however, the di cultyis experienced that the paper has a tendency to adhere to the metal roll to such an extent arating it'therefrom,,causing delays an ecreased production.

Another method of separating the paper from the felt is to run the felt a considerable distance in a substantially horizontal plane, and attempt to lift the paper off the felt, passing it over a roller arranged more or less remote with respect to the felt. The

however, tends to adhere tightly to particularly as they have usually been previously pressed together in passing through the us al-moisture expressing pres sure rolls, and'as a result of this adherence it is diflicult to effect separation of the paper without breaking it. It is, accordingly, an ob ect-of the present 1924. Seth-l No. 719,585.

invention-to provide a means for separating the web of paper pulp from its carrymg felt which will eliminate breakage of the paper and enable the machine to be run without interruption.

Another object of the invention is to effect the separation of the web of paper from the felt without the adherence of the paper to the. removing roll.

A further object of the invention is to provide a roller-which, in the operation of the web of paper in its preferred initial p'osition when the machine is firststarted in operation.

Fig. 2 is a diagrammatic side elevation of the same, showing the web of .paper arranged in accordance with the present invention'for continuous running through the machine after it has been started.

An illustration of the whole of apaper making machine not beingnecessary to the present invention, certain .parts not pertinent I thereto have been omitted in the interestof simplicity. The usual or any desired type of paper In king machine may be used in connection with theinvention, and to the left of Fig. 1 may be, for example, the usual Fourdrinier machine, wire, and a first set of press rolls between which pass the upper and lower wool felts carrying the web of.

paper" pulp. The web of paper is then transferred to the pick up felt 9, and is shown as being carried on the bottom of said felt, which is preferably of porous or fibrous materiahthough it could as well be carried on the top thereof, and the arrangement of rolls altered accordingly.

In accordance with the present invention, when the machine is started in operation,

the film of paper 10 follows the pick up felt 9 successively over the felt carry-in rolls l1 and 12 in the direction indicated y the arrows, andv both the felt and paper pass between the upper and lower press rolls 13 and 1a, where the film of paper collects on the doctor 15. 1

' tate on a fixed axis, or may be mounted to be adjusted toward or away from the felt 9. If desired, it may be mounted on a shaft urged toward the felt 9 by a spring, or may be otherwise 'yieldably mounted. In any case, the roll 16 is, in accordance with the present invention, so arranged that it presses very lightly against the paper web, its pressure being sufiicient to insure separation of the web from the felt, but not suflicient to cause the paper to adhere to the roll.

When the machine is started in operation,

both paper web and felt ride past the roll 16, and, as described, pass between the press rolls 13 and 14:

To effect separation of the paper web from the felt 9, for the purpose of passing the paper web through the remainder of the machine, and particularly over the dryer, the pa er on the Fourdrinier wire is cut throng thus starting a new strip, which travels with the pick up felt 9 until it reaches the rider roll 16. The paper web passes the rider roll 16 between it and the felt 9, and at this point it is detached from the pick up felt and is led over the roll 16, as shown in Fig. 2, and through the remainder of the machine.

By way of illustration, it is shown as pass ing over-the paper carrying roll 17 to the dryer 18, around the dryer between it and the dryer felt 19, which travels over suitable dryer felt rolls :20, 21, 22 and 23, the paper web being shown as then passing over the paper roll 24: to be ultimately wound on reels in the usual manner. 7

It is found that, although the roll 16, arranged as described against a sheet of paper which adheres to a pick up felt, does not of itself initially pick the paper off the pick up felt unless the end of the paper is led over the roll, yet it does, in operation, keep the paper sheet from adhering to the pick up felt after it passes the roller.

Where two pressure rolls are used for offecting separation of the paper from the felt, the pa er is pressed not only into the felt, but so against the removing roll. Further, the roll on the felt side tends to prevent the entrance of air between the .felt and the paper, and because of this vacuum effect, and the increased pressure of the web of paper into the felt, and especially its pressure against the removing roll, the

er web adheres.to this roll to such an extent that the force required to remove it frequently causes it to break.

The single roll used in the present invention, on the other hand, exerts very slight pressure on the paper and felt, does not press the pape into the felt, and leaves one side of the felt completely clear for the entrance of air bet ween the porous felt and paper. Particularly. the felt and paper web are urged against this single roll only by the tension of tbe felt, with the result that the paper does not adhere to the roll, but comes off the roll readily and without breakage.

Where two rolls are used, and it is desired in cll'ect the separation of the paper from the felt in a:-cordance with the present invention, they may be adjusted with respect to each other so that the paper is not p essed against the removing roll with enough force to cause its adherence thereto.

What is claimed is:

1. In a paper making machine, a plurality of spaced felt-carrying rolls, a pick-up felt trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for effecting separation of the web from the felt in the operatiop of the machine comprising, a single roller spaced from said felt-carryinp rolls and bearing upon the web intermediate a pair thereof.

2. In a paper making machine, a plurality of spaced felt-carrying rolls, a porous pickup felt trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for effecting separation of the web from the felt in the operation of the machine comprising a single roller spaced from said felt-carrying rolls and bearing upon the web intermediate a pair thereof.

3. In a paper making machine, a pluralit of spaced felt-carrying rolls, a pick-up fell trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for effecting separation of the web from the felt in the operation of the machine comprising a single roller spaced from said felt-carrying rolls and exerting a pressure against the web and felt suliicient to effect removal of the web from the felt without causing adherence of the web to the roller.

4. In a paper making machine, a plurality of spaced feIt carrying rolls, a pick-up felt trained abont'the rolls and carrying a moist web of paper pulp adhering thereto, and

means fol-effecting separation of the'web from the felt in the operation of the machine including a roller associated with the felt aeeaeea intermediate and in spaced relation to the felt-carrying rolls, said felt hem urged toward the roller b a pressure sufiicient to effect separation o the web from the felt without causing adherence of the web to the roller.

of spaced felt-carrying rolls, a pick-up felt trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for efi'e-cting separation of the web from the felt comprising a pressure roller mounted in coacting relation to the felt and out of direct coacting relation with said rolls.

7. In a paper making machine, a plurality -of spaced felt-carrying rolls, a pick-up felt trained about therolls and carrying a moist web of paper pulp adhering thereto, and

means for effecting separation of the webfrom the felt comprising a pressure-exerting device mounted in coacting relation to the felt and out of direct coacting relation with said rolls.

8.' In a paper making machine, a plurality of spaced felt carrying: rolls, a pick-up felt trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for effecting separation Ofille web from the felt comprising a pressure-exerting roller spaced from the felt-carrying rolls and-contacting with the web to urge the web and felt against the tension of the felt.

9. In a paper making machine, a plurality of spaced felt-carryingrolls, a pick-up felt trained about the rolls and carrying a moist web of paper pulp adhering thereto, and means for effecting separation of the web from the felt comprisin; a rider roll associatcd with the felt out of direct coacting relation with the rolls and exertingpressure against the tension of the fcltinternicdiate the felt-carrying rolls.

10. In a paper making machine, a plurality of spaced felt-carrying rolls, a pickup felt carried thereby and carrying a moist &

web of paper adhering thereto and means for effecting separation of said moist web from said felt intermediate two successive felt carrying rolls comprising a rider roll associated with said felt out of direct coactp ing relation with the rolls and acting against 6, In a paper making machine, a plurality the tension of said felt intermediate said two successive felt-carrying rolls.

. 1'1. In a paper making machine, a pick up felt carrying a moist web of paper adhering thereto, and means for efi'ecting separation of said moist web from said felt coin prising a rider roll associated with said felt, and said felt being urged against said rider roll only by its own tension.

12. In a paper making machine, a pick up felt supporting a moist film of paper and to which the moist film has a normal tendcnoy to adhere, and a pressure exerting detit) vice contacting with one Side of said felt.

and normally exerting pressure thereagainst and constituting the sole means for effecting separation ofsaid film from said felt.

13. In a paper making machine a pick up felt of porous materiel supporting :1 moist film of paper and to which the moist film has a normal tendency to adhere, and a pressure exerting device contacting with one side of said felt andnormally exerting pressure thereugainst and constituting the sole means for effecting separation of said film from said felt.

14. In a paper making machine, a pick up felt of porous material supporting a moist film of paper and to which the moist film has a normal tendency to adhere, and a roll contacting with one side of said felt and normally exerting pressure thereagainst and constituting the sole means for effecting separation of said film from said felt and adapted to develop a vacuum effect with respect to the film only on the roll side thereof.

- AUSTIN E. corms.

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